Chemical basis of the resistance of barley seeds to pathogenic fungi

  • Garcia S
  • Garcia C
  • Heinzen H
 et al. 
  • 2

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Abstract

The 5-(n)-alkylresorcinol fraction of the epicuticular waxes of Hordeum vulgare seeds appeared to be responsible for their in-born resistance to pathogenic fungi such as Aspergillus niger and Penicillium crysogenum. The antifungal properties of this fraction were evaluated qualitatively and quantitatively with a novel bioassay where the extreme lipophilicity of these compounds was taken into account. The minimum inhibitory concentration in the fungi tested ranged from 5.6 to 10 micrograms cm-2 for the alkyresorcinols. The behaviour of the different cultivars against these fungi could be predicted by measuring the natural amount of resorcinols of each variety by TLC-scanning densitometry. The ranking of cultivars thus established correlated well with the field behaviour of each cultivar, providing a useful and rapid method for predicting the behaviour against fungi of new varieties being developed.

Author-supplied keywords

  • Chromatography, Thin Layer
  • Fungi/*pathogenicity
  • Hordeum/chemistry/embryology/*immunology
  • Microbial Sensitivity Tests
  • Resorcinols/isolation & purification/pharmacology
  • Seeds/chemistry/*immunology

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Authors

  • S Garcia

  • C Garcia

  • H Heinzen

  • P Moyna

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